When I was on a site visit last quarter with a new automotive parts manufacturing client, their entire automated storage and retrieval system (AS/RS) ground to a halt 12 minutes into a local power outage. The site manager was panicking because they had 1,200 high-value engine cylinders locked in the system’s rack aisles, and emergency protocols they’d written relied on a generator that never activated—thanks to a misconfigured transfer switch that only kicked in for the plant’s lighting and HVAC, not their AS/RS. That incident isn’t an anomaly: over 60% of mid-sized AS/RS users we’ve surveyed in the last two years have reported unplanned downtime from power-related failures, and most admit their backup plans are outdated, under-tested, or entirely missing. As an AS/RS supplier, I don’t just sell equipment— I’ve spent years walking clients through what actually works when the grid drops, from the common (but often misapplied) to the niche options that don’t make it into generic tech blogs. Automated Storage and Retrieval System
Let’s start with the foundation of any AS/RS backup plan: power redundancy, because nothing else matters if you can’t keep the system’s core components running during an outage. Most people assume a standard diesel generator is enough, but that’s a mistake for two reasons. First, generators take 10 to 30 seconds to come online—and AS/RS drives, motor controls, and safety sensors can shut down irreparably in less than 10 seconds if they lose power unexpectedly. Second, AS/RS units draw massive, inconsistent power loads when they start: a single high-density rack crane in a mini-load AS/RS can pull 150% of its rated load when accelerating, which can trip a generator’s overcurrent protection right as it starts. For that reason, we don’t recommend relying on a generator alone as primary backup for critical AS/RS. Instead, we pair generators with uninterruptible power supply (UPS) systems sized specifically for AS/RS, not generic industrial equipment.
Not all UPS are created equal for AS/RS. A lot of small businesses buy off-the-shelf line-interactive UPS for their servers, but those don’t have the fast response time or high power density needed for AS/RS cranes and conveyor systems. The UPS we specify for our clients are double-conversion online UPS with a transfer time of less than 2 milliseconds—fast enough to keep crane drives running without any drop in torque or position accuracy. For a standard mini-load AS/RS serving a 50,000-square-foot warehouse, we size the UPS to carry the full AS/RS load (including cranes, conveyors, and control systems) for 15 to 30 minutes, which is exactly the window most diesel generators need to stabilize and take over. We also integrate the UPS with the AS/RS’s safety controller, so if the UPS detects a prolonged outage, it automatically triggers a controlled shutdown sequence instead of letting cranes and conveyors coast randomly. That sequence moves any loads in motion to the nearest accessible storage location, locks all cranes in place within their aisles, and disengages conveyors to prevent jams.
Of course, generators aren’t one-size-fits-all either. For clients with AS/RS serving high-throughput, 24/7 operations (like e-commerce order fulfillment centers or pharmaceutical cold storage warehouses), we specify parallel generator setups. These link two or more diesel generators to share the AS/RS load, which reduces the risk of a single generator failing during startup and lets us size the system for gradual load increases as the business grows. For smaller clients with mid-sized AS/RS (like a 10,000-unit unit-load system for a local food distributor), a compact, natural gas-powered generator is often a better choice—it starts faster (cutting startup time to 8 seconds) and has lower emissions, which is a plus for facilities in urban areas with strict environmental regulations. We always test generator-UPS integration at our in-house AS/RS lab before installation, too—there’s no substitute for actually running a simulated outage with the exact load profile of your system.
But power backup is only half the story. Even if you can keep the lights on, AS/RS systems rely on control systems, software, and sensor data that can go haywire during a power blip or prolonged outage. That’s where control and data backup comes in, a layer I see almost every client overlook in their initial planning. The AS/RS’s PLC (programmable logic controller) and warehouse management system (WMS) are the brain of the whole operation—if those lose power or crash, even a working crane can’t move a single load. For critical applications, we install redundant PLCs with hot standby capability: if the primary PLC loses power or experiences a fault, the backup takes over in less than a second, no downtime for control functions. We also deploy WMS backup on a geographically separate server, not just a network drive on the same site. That means if a power surge takes out your main server rack, your WMS data and core logic are still accessible, so when power is restored, you don’t have to manually re-enter 10 hours of order or storage data.
Sensors are another often-overlooked part of control backup. AS/RS cranes use position sensors (usually encoders or laser distance sensors) to navigate racks with millimeter accuracy, and conveyor systems use photoeyes to detect loads. If these sensors lose power mid-cycle, a crane can ram into a rack or drop a load. That’s why we recommend sensor-level battery backup: small, low-cost lithium-ion batteries that power all critical sensors for the same 15 to 30 minute window as the UPS, so cranes can complete their current cycle safely before initiating the controlled shutdown. We also add a redundant encoder for each crane axis—if the primary encoder fails mid-outage, the secondary one kicks in, keeping navigation accurate even when power is limited.
Now, let’s talk about the niche backup options that are only relevant for specific high-risk industries, but can be make-or-break for clients in those sectors. For pharmaceutical and medical device AS/RS, where power outages can risk spoiling temperature-sensitive inventory (like vaccines or biologic materials), we combine standard power and control backup with independent environmental backup. That means a separate, battery-powered HVAC system for the AS/RS rack aisles, plus a backup power system for temperature sensors and alarms. We worked with a Seattle-based biotech client last year that needed their AS/RS to maintain a 2 to 8 degree Celsius temperature during outages, even when the main plant HVAC was offline. Our solution was a 48V lithium-ion battery bank powering a small, ductless HVAC unit dedicated to the AS/RS aisles, with a cellular alarm that texts the site manager if temperature drifts outside the safe range. That client went through a 4-hour grid outage last winter, and their AS/RS inventory stayed perfectly preserved—something they told us would have cost them $2.7 million in losses without that backup layer.
For climate-controlled warehouse AS/RS in hurricane or wildfire-prone regions, we sometimes include independent backup power for the AS/RS’s fire suppression and security systems, since grid outages often coincide with weather-related fires or breaches. That’s a small add-on, but it prevents a worst-case scenario: a controlled shutdown of the AS/RS, followed by a fire breaking out and no ability to trigger sprinklers because the main power is down.
But here’s the hard truth: even the best backup system is useless if it’s not tested regularly. Last year, we had a client in Dallas who’d installed a top-tier UPS and generator system, but never tested it for 18 months. When a winter storm knocked out power for 6 hours, the generator failed to start because a clogged fuel filter had gone undetected, and the UPS died after 20 minutes—resulting in $800,000 in lost production and damaged inventory. Now, for all our clients, we include a mandatory annual backup testing package as part of our ongoing support contracts. That testing isn’t just a 10-minute check of the generator—it’s a full simulated outage, including triggering the controlled shutdown, verifying PLC redundancy, testing sensor battery backup, and confirming that when power is restored, the AS/RS restarts seamlessly without manual intervention. We also provide clients with a detailed report after each test, highlighting any gaps, like a weak battery or misconfigured transfer switch, so they can fix them before a real outage.
I wish I could say power outages are rare, but with grid aging and more extreme weather events every year, it’s not a question of if your AS/RS will experience a power issue—it’s when. The good news is that backup options for AS/RS have come a long way from the old diesel generator and a prayer that most smaller users rely on now. Whether you’re a small manufacturer with a unit-load AS/RS, a large e-commerce fulfillment center with a high-density mini-load system, or a biotech firm with temperature-critical storage, there’s a backup solution tailored to your needs.
If you’re worried about unplanned downtime, lost inventory, or disrupted operations the next time the grid drops, we can help you assess your current AS/RS backup setup, identify gaps, and design a customized solution that fits your budget and operational needs. Reach out to our team to learn more and schedule a consultation.
Autonomous Mobile Robot References
Industrial Safety and Security Systems: Backup Power for Automated Material Handling Systems, 2022, Material Handling Industry Association
AS/RS Reliability Report, 2023, Automated Storage and Retrieval System Suppliers Association
Emergency Power Systems for Warehouse Automation, 2021, National Fire Protection Association
Lithium-Ion Battery Backup for Industrial Automation, 2022, International Society of Automation
Geographic Redundancy for WMS and AS/RS Control Systems, 2023, Warehouse Education and Research Council
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